interface Vehicle {
    public String star(String s);
    public String stop(String s);
}

class Bike implements Vehicle {

    @Override
    public String star(String s) {
        return s;
    }

    @Override
    public String stop(String s) {
        return s;
    }
}

class Bus1 implements Vehicle {

    @Override
    public String star(String s) {
        return s;
    }

    @Override
    public String stop(String s) {
        return s;
    }
}

public class Test_1 {
    public static void main(String[] args) {
        run(new Bike(),"自行车");
        run(new Bus1(),"公交车");
    }
    public static void run(Vehicle v,String s) {
        String S = v.star(s+"启动");
        String T = v.stop(s+"停止");
        System.out.println(S);
        System.out.println(T);
    }
}
